Preparation of a Self‐Supported SiO₂ Membrane as a Separator for Lithium‐Ion Batteries

Abstract

For the first time, electrophoretic deposition (EPD) has been employed to prepare a self-supported, inorganic membrane consisting of SiO 2 nano-fibers, as a separator for lithium-ion batteries. The SiO 2 nano-fibers that were fabricated by a lowcost force spinning technique were deposited by EPD directly onto LiNi 0.8 Co 0.15 Al 0.05 O 2 cathode material. Citric acid charging agent and anhydrous acetone solvent were used. The resulting porosity and tortuosity of the EPD SiO 2 separator were 71.42 %, and 1.70, respectively. The slightly higher tortuosity of the EPD-SiO 2 -fiber separator (60 μm) led to a lower rate capability in comparison to commercial GF/A glass fiber separator (260 μm). On the other hand, the latter exhibited lower self-discharge than the former in full-cells with a graphite anode; this is proposed to be related to the different purities of the two materials that impart different electronic properties or the presence of 20 wt % PVDF in the EPD-SiO 2 separator. Indeed, the deposited membrane has good characteristics as a battery separator and the EPD process is extremely feasible for the fabrication of miniaturized lithium-ion batteries on wafer level.[a] Dr.

An image reconstruction modeling approach for micro‐fibrous network of cellulose polymer separator concerning tensile and pore properties

“…It is obvious that different researches bring about varied tortuosity data. Kyeremateng et al 40 have prepared a self‐supported inorganic membrane composed of SiO 2 nano‐fibers, which has presented a porosity over 70% and tortuosity less than 1.7. Takeda et al 41 and Thorat et al 42 shared membranes with porosity around 50%, but with tortuosity of 2.1 and 2.6, respectively.…”

Modern practices in electrophoretic deposition to manufacture energy storage electrodes

“…The EPD conditions used for the study in question were very similar for producing high mass loadings (and decent coating thicknesses) for SiO 2 separators for LiB applications (shown as an example only in Table 6). 254 …”

“…248 The EPD conditions used for the study in question were very similar for producing high mass loadings (and decent coating thicknesses) for SiO 2 separators for LiB applications (shown as an example only in Table 6). 254 In a recently published work, a binder-free EPD procedure was used for preparing TiN nanocoatings with a rapid time constant of 10 ms (determined via impedance spectroscopy). 260 These nanocoatings were then sintered and resulted in high-performance supercapacitor electrodes with a capacitance of 120 F g À1 at a high current density of 2 A g À1 .…”

Ultrathin atomic layer deposition Al2O3 coatings on graphite cathode materials for improving anti‐self‐discharging Al‐ion battery

“…Some reports have focused on the development of rechargeable Li‐ion batteries with the prevention of self‐discharge by using carbon materials as conductive source along with modified membrane with different materials operated at certain temperature conditions. For example, a self‐supported, inorganic membrane consisting of SiO 2 nano‐fibers was developed as a separator for lithium‐ion batteries by using electrophoretic deposition method [6]. The inorganic SiO 2 ‐coated membrane exhibited lower self‐discharge, which could be due to that impart different electronic properties in comparison with a commercial separator.…”